Switching power supply apparatus

a power supply and switch technology, applied in the direction of electric variable regulation, process and machine control, instruments, etc., can solve the problems of reducing the size of the device, increasing the cost, increasing the power consumption of the standby device, etc., to reduce the audible sounds generated by the isolation transformer and specific to burst oscillation, the effect of reducing the power consumption during the standby
US7746672B2Inactive Publication Date: 2010-06-29FUJI ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
FUJI ELECTRIC CO LTD
Publication Date
2010-06-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

A switching power supply apparatus which includes a DC power supply, an isolation transformer having primary, secondary and tertiary windings, and a switching element, and in which, by turning the switching element on and off, the high-frequency voltage appearing in the secondary windings of the isolation transformer is rectified to obtain a DC output, power consumption can be decreased during standby (in burst mode) in particular by means of a control circuit which controls the turn-on and turn-off of the element and similar.
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Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application is based on, and claims priority from, Japanese Patent Application JP 2007-173957 filed Jul. 2, 2007, the contents of which are incorporated herein by reference.BACKGROUND

[0002] This invention relates to a switching power supply apparatus which obtains an insulated DC output from a DC power supply, and in particular relates to a switching power supply apparatus which is capable of reducing the power consumption during standby.

[0003] In recent years efforts have been made to reduce the power consumption of electrical equipment, as a measure to alleviate global warming. In particular, there have been numerous proposals of inventions relating to switching power supply apparatuses provided with a standby mode, to supply only the minimum necessary electric power to devices, so as to reduce the power consumed when electrical equipment is not being used (see Japanese Patent Laid-open No. 2002-136125 and Japanese Patent Laid-open No...

Claims

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